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Revenue - Schedule of Disaggregation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 1,637,759 | $ 1,469,871 | $ 3,704,417 | $ 3,315,071
Regulatory cost recovery revenue | 3,000 | 5,000 | 36,000 | 16,000
Retail Electric Service | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 883,393 | 743,061 | 1,835,432 | 1,647,996
Retail Electric Service | Non-Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 649,164 | 547,979 | 1,572,013 | 1,370,164
Wholesale Energy Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 57,801 | 139,741 | 180,686 | 198,546
Transmission Services for Others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 43,286 | 36,321 | 108,229 | 91,165
Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 4,115 | 2,769 | 8,057 | 7,200
Electric and Transmission Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 1,635,000 | $ 1,465,000 | $ 3,668,000 | $ 3,299,000

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